Function fn

test/sequential/test-watch-mode.mjs:822–827

(message)

    async function waitForEcho(msg) {
      const receivedPromise = new Promise((resolve) => {
        const fn = (message) => {
          if (message === msg) {
            child.off('message', fn);
            resolve();
          }
        };
        child.on('message', fn);
      });
      child.send(msg);